Allow some more control over the MKL Pardiso settings, especially setting the matrix
type by using keyword 'Linear System Matrix Type', with choices

o 'general' or 'nonsymmetric'
o 'postive definite'
o 'symmetric idefinite'
o 'structurally symmetric

the last three also need the setting "Linear System Symmetric=True".

If this keyword is not given, the matrix type is determined as

o "Linear System Symmetric=False" -> 'nonsymmetric'
o "Linear System Symmetric=True" & "Linear System Positive
Definite=true"  -> 'positive definite'
o "Linear System Symmetric=True" & "Linear System Postive
Definite=False" -> 'structurally symmetric'

Note that the "Structurally Symmetric" mode of the MKL Pardiso can't handle
(symmetric) indefinite matrices.


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6975 04224531-1f84-46d8-96ce-875b9e37dce3
Revert backward incompatible change in previous commmit.


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6976 04224531-1f84-46d8-96ce-875b9e37dce3